Sim racing glossary and terminology

Sim racing carries three separate vocabularies stacked on top of each other: iRacing’s rating system, the driving craft, and the hardware. The jargon exists because each one tracks something distinct, and conflating them is the most common newcomer mistake. Terms are grouped below by domain. iRacing-specific terms are flagged as such.

iRacing rating and licensing terms

iRating — your skill rating, a single number that rises when you finish ahead of drivers rated higher than you and falls when you finish behind lower-rated drivers. It has nothing to do with your license or safety. A driver bragging about “666” is talking about iRating alone. When you study laps, it helps to compare against a driver rated a few hundred iRating above you rather than the outright fastest alien.

Safety Rating (SR) — scored 0.00 to 4.99, it measures how cleanly you drive by weighing incident points against the number of corners you complete. Hit SR 4.00 (or 3.00 as a Rookie) and you earn a fast-track promotion that advances your license mid-season instead of waiting out the full 12 weeks.

Incident points (0x / 1x / 2x / 4x) — the penalty values iRacing assigns to mistakes. 0x is a light brush of a wall or car, 1x is going off-track with all four wheels, 2x is a spin or hard wall contact, and 4x is hard contact with another car, the worst class. When someone posts “4x for that?!” they mean they took the maximum penalty. More incidents per corner tanks your SR.

License classes — Rookie, then Class D, C, B, A, and Pro. Your class gates which series you can enter. It is a separate ladder from both iRating and SR.

SOF (Strength of Field) — the average iRating of everyone in a session. It sets the size of the points pool: a higher SOF means more iRating on the table. Top-split GT3 endurance races run an SOF around 8,000-9,000; a top-split daily official often sits near 5,000-6,000.

Splits — when more drivers register for one official race than a single grid holds, iRacing divides them into parallel sessions ranked by iRating. The “top split” is the highest-rated group. Each split runs independently, so there is one winner per split.

Week 13 — the unofficial fun week between the 12-week seasons. Many Week 13 series are marked “fun” and run unranked, so SR and iRating do not count, but the popular series in each license class still run ranked. Check the series before you treat it as a sandbox.

Tanking / smurfing — intentionally lowering your iRating, SR, or license, or running a second low-rated account, to face weaker fields. The sporting code permits multiple accounts but bars using them for unsportsmanlike conduct.

Protest / sporting code — the sporting code is iRacing’s rulebook; a protest is a formal report you file against another driver for an on-track violation.

Racecraft and driving terms

Trail braking — carrying brake pressure past turn-in and bleeding it off gradually as you add steering. It keeps weight on the front tires, sharpening turn-in. See racecraft fundamentals for the technique.

Understeer — the front tires lose grip first and the car pushes wide of where you point it.

Oversteer — the rear tires lose grip first and the back end steps out. Lift-off (or snap) oversteer is when that happens because you lifted the throttle mid-corner, shifting weight off the rear.

Racing line / apex — the fastest path through a corner; the apex is the point where you run closest to the inside.

Undercut / overcut — pit strategy. Undercut means pitting earlier than a rival to gain time on fresh tires; overcut means staying out longer to do the same.

Multiclass — a race mixing car classes of different speeds, like GT3 and LMP2. A blue flag warns a slower car that a faster class is closing to lap it.

Gridding — lining up in starting order before the green.

BOP (Balance of Performance) — adjustments to weight, power, restrictor, and aero that equalize different cars within one class. Combined with a given track’s layout, BOP produces a weekly “meta” car that is fastest that week, which is why your lap time can drop when you switch off it.

Hardware and force feedback terms

FFB (Force Feedback) — the forces the wheelbase pushes back through the wheel so you feel grip, weight transfer, and the road.

FFB clipping — when the commanded force exceeds the base’s maximum output and detail is lost at the top of the range. The fix is lowering in-game FFB; on a Moza R9, keep in-game around 65-80% and run the base software at 100%. See force feedback setup.

FFB gain — the master strength setting that scales how hard the forces hit.

Direct Drive (DD) — a wheelbase where the motor shaft drives the wheel directly, with no belts or gears, for cleaner detail and higher torque.

Load cell pedal — a brake pedal that measures force (how hard you press) rather than travel (how far). It lets you brake to the same load lap after lap.

Quick release (QR) — the coupling that lets you swap wheel rims off the base without tools.

Triples — a three-monitor setup for a wider field of view.

Setup terms

Ride height / rake — how high the car sits; rake is the front-to-rear difference, with the rear higher than the front.

Camber — the inward or outward tilt of the tire from vertical, tuned for cornering grip.

Toe — whether the tires point slightly inward or outward, trading stability against responsiveness.

ARB (anti-roll bar) — controls how much the car leans in corners and shifts grip balance front to rear.

Diff preload — the locking behavior of the differential, affecting how the car rotates on and off throttle.

TC (traction control) — limits wheelspin on power. ABS (anti-lock braking) prevents the wheels from locking under braking. Both are driver aids you can tune or disable per car.